How to Troubleshoot Pedal Pi

Hi Ray,

Sorry I missed listing changing the potentiometer, I did try adjusting at different positions but still had the same hesitation.

Thanks
David

Hi Ray,

It’s kind of like if you were listening to music on an old computer and when the computer loads the sound stutters. I will see if I can attach an audio file tonight.

Thanks for your help so far!

Dave

Hello Ray, you seem to be the expert around.

I finished soldering but I'm running into some problems. Here are my findings.

1. RV1 trimmer is set at the middle. Output is on the left and Input is on the right
2. While using the script triangular_signal I do hear the signal generated from the pedalPi into my speakers
3. The 3 dots show the appropiate voltage (1.6, 5.0 and 3.3)

Here's where the problems start

1. Once read_hardware is running all the buttons work, however the ADC reports values of 2800+. Very steady but way over range, even if I connect a guitar or just touching the tip of the jack it doesn't change at all.
2. I can't hear anything from the output while the footswitch is on. The led lights correctly but I believe that's done through hardware
3. I tried to resolder as many bad joints as I see fit
4. The MCP3202 (up) and the MCP6002 (down) have the dots facing each other
5. The MCP3202 pins 5,6,7 have continuity with raspberry's 19, 21 and 23

I'm attaching the pictures of my pedal Pi

Please let me know what can I try, I'm afraid I might have broke something while soldering

Hello Ray

I've followed your instructions but I have very different readings from the MCP6002

4th pin: 0.001
5th pin: 0.001
7th pin: 0.001
8th pin: 5+

I remember having some problems with R02 because I had to de-solder it when I first started. That was a pain to do. Is it possible it's burned?

Thank for the help. I'm looking forward to hear from you

Hello Ray

Thank you for the quick reply. Unfortunately I'm out for holidays. I'll get back to you to report on any progess in 2 weeks.

Let's all enjoy some hot cocoa and burn our fingers while soldering!

Happy xmas

Thanks for posting the pic. When I checked it against my build I saw I had U2 the wrong way around. Symptoms were no output when effect button pressed, 2.5v instead of 5v and 0.8vinstead of 1.6v. Working great now, thanks!